Kallache, M. and Naveau, P. and Vrac, M. (2013) Spatial assessment of precipitation deficits in the Duero basin (central Spain) with multivariate extreme value statistics. Water Resources Research, 49 (10). pp. 6716-6730. ISSN 00431397
Full text not available from this repository.Abstract
Nonirrigated agriculture on the Iberian Peninsula is regularly affected by dry periods that can cause important losses. This paper focuses on the comparison of the classical Standard Precipitation Index (SPI) with a fragility index developed by the multivariate extreme value theory community, which is used to describe monthly precipitation deficits below 30.5 mm (about 1 mm/d) in the Spanish Duero basin. The multivariate extreme value model allows to capture relevant information concerning the dependence structure among extreme precipitation deficits. Maps of those extremal dependence summaries and of loadings of principal components of the SPI provide quantitative information for water management. In addition, jointly analyzing data from several stations improves the inference of uncertainty. Spatial patterns of extremal dependence emerged with respect to orographic features. Most severe dry spells occur in the southeast of the Duero basin. In central plain of the Duero basin, a predominantly agricultural area, a strong fragility index for severity of dry spells is particularly found in eastern regions. Results of the MEVT and SPI analysis point in the same direction. Beyond this, the MEVT assessment gives a quantitative measure of the dependence between stations and regions. Estimates of return periods for extreme dry spell severity are discussed. Deficits below 42.7 mm are also analyzed.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | multivariate extreme value statistics; droughts; Duero basin; extremal dependence; spatial analysis; SPI |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > QA Mathematics |
| Depositing User: | José Ángel Gómez Martín |
| Date Deposited: | 27 Jan 2014 09:17 |
| Last Modified: | 27 Jan 2014 09:17 |
| URI: | http://eprints.imdea-agua.org:13000/id/eprint/374 |
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